I'll Be Seeing You by Mary Higgins Clark (Paperback) Pocket Books, 1994.
The murdered woman could have been her double. When reporter Meghan Collins sees the sheet-wrapped corpse in a New York City hospital, she feels as if she's staring into her own face. And Meghan has troubles enough already without this bizarre experience. Nine months ago, her much-loved father's car spun off a New York bridge. Now, investigators are saying that there's no trace of his car in the river, and they suspect he faked his own death. With frightening speed, links start to appear between Meghan's father and her dead lookalike. Meghan may be in danger herself, but she's determined to find the truth to the mystery. In a nightmare journey spiraling from New York to Connecticut to Arizona, Meghan finds that the truth can sometimes be deadly.